CS198751B1 - Method of hydrophilic procedure of abrasive tools - Google Patents

Description

The invention relates to a method for hydrophilizing glass abrasive tools made from a mixture of organic binder and abrasive from the group of feldspar, quartz sand, topaz, solitude and the like.

The abrasive tools thus produced, according to the author's certificate No. 180090, from a mixture containing 7 to 20 wt. % organic binder and 80 to 93 wt. abrasives consisting of materials from the group of feldspar, quartz sand, topaz, solitude, etc. are intended to replace abrasive tools made of natural sandstone. Tools made of natural sandstone are mostly bonded with clay mastics, which create conditions for good water absorption and wettability, so that the active surface of the tool is lubricated with a fine water film and thus avoids high temperatures on the ground glass and so-called glass burning.

Grinding tools made from a mixture according to es. No. 180090 eliminates a number of disadvantages of natural sandstone grinding tools such as inhomogeneity, low mechanical strength, etc. However, they do not achieve better or identical hydrophilic properties and therefore have a higher water consumption for wetting them.

A known method of hydrophilizing abrasive tools, in which a silica gel is formed in the pores of the tool by acid hydrolysis of an aqueous alkali silicate solution,

198 751

198 751 removes this deficiency only partially.

The deficiency is substantially eliminated by the method of hydrofillzaoe abrasives for grinding and polishing glass, produced from a mixture of organic binder and abrasive from a material selected from the group of feldspar, quartz sand, topez, loneliness, etc., which is based on the fact that tools form a silica gel by hydrolyzing solutions of organosilicon esters.

Impregnation can be carried out either by painting the abrasive tool or by immersing it in an organosilicon ester solution. Various organic solvents can be used, such as aoetone, ethyl alcohol, and the like, which have a relatively low surface tension and thereby improve the penetration rate of the impregnating agent into the interior of the abrasive tool.

The released silica gel both reduces porosity and increases the hydrophilicity of the abrasive tool. This increase in grinding properties substantially improves the adhesion of the cut and polished glass to the working surface of the tool. The wettability and smoothing of the abrasive tool will be improved, thus avoiding burning of the cut glass * The water consumption is significantly reduced.

The advantages of this method of hydrophilic grinding tools are evident from the examples below which illustrate the invention without limiting it in any way.

Example 1

The grinding wheel of 600 mm diameter was immersed in a solution of ethyl silicate containing 40% by weight for eight hours. parts of silica which was mixed with a solution of 6 wt. parts of concentrated hydrochloric acid in 24 wt. parts of ethyl alcohol and 30 wt., parts of water. After removal from the impregnating solution, the disc was placed in the air for 24 hours. Then, the wheel was ready to be used for grinding glass sheets of about 100 µm. The average roughness factor of the ground surface was R & 0.25 µm with cooling water consumption of less than 60 m / min.

Example 2

A grinding wheel of 600 mm diameter was hydrophilized in an analogous manner to Example 1 except that the impregnating solution was applied to the grinding wheel surface by a brush, the coating being repeated three times after each contact with the steel. The hydrophilized wheel behaved in the same manner as the grinding wheel of Example 1 during grinding.

Claims (1)

OBJECT OF THE FINISH A method for hydrophilizing glass cutting and polishing tools made from a mixture of an organo-binder and an abrasive of a material selected from the group consisting of yellowish, quartz sand, topaz, chamotte and the like, characterized in that a silica gel is formed esters.